Mickey Mouse operates a steam shovel; Pegleg Pete is his foreman; Minnie Mouse sells box lunches. Mickey must save the day when Pete makes advances to Minnie.
"Building a Building" is a marvelously inventive film that takes full advantage of its construction-site setting for gags and thrills. Heroic little Mickey is utterly sympathetic as the adversary of the brutish Pete, even though the mouse's careless work habits (he's so focused on Minnie that he accidentally throws dirt and bricks on Pete) give his boss good reason to be angry with him.
Pete's attempts to kiss an unwilling Minnie remind us of how Mickey has changed in a few short years. In "Plane Crazy" (1928), it was Mickey trying to force himself on her. She even had to jump out of his plane to escape him.